I am using KDE 4.13.3 (I believe it is the kubuntu-desktop download) on Ubuntu 14.04. I changed Systems Settings->Workspace Appearance and Behavior->Workspace Behavior->Virtual Desktops to have 4.
However, if I have Firefox running in Workspace 1, it shows up, not just in the bottom panel of Workspace 1, but also Workspace 2, Workspace 3, and Workspace 4, partially defeating the purpose of having Workspaces in the first place, and not what I would expect as the default behavior.
Is there a way I can get applications started in one Workspace to only display in the bottom panel of the Workspace they were started in - or is that bottom panel for "all workspaces"?
Right click on the task manager located on the bottom panel -> access Settings -> select "Only show tasks from the current desktop".